Degradation of slime extracellular polymeric substances and inhibited sludge flocs destruction contribute to sludge dewaterability enhancement during fungal treatment of sludge using filamentous fungus Mucor sp. GY-1. (September 2015)

• Record Type: Journal Article
• Authors: Wang, Zhenyu; Zheng, Guanyu; Zhou, Lixiang
• Is Part Of: Bioresource technology. Volume 192(2015)
• Page Start: 514
• Page End: 521
• Publication Date: 2015-09
• Subjects: FF filamentous fungi -- SRF specific resistance to filtration -- CST capillary suction time -- LSB liquid state bioconversion -- SSPRSD simultaneous solids and pathogens reduction, settling and dewatering -- EPS extracellular polymeric substances -- TSS total suspended solid -- VSS volatile suspended solid -- PCR polymerase chain reaction -- TOC total organic carbon -- SEM scanning electron microscope; Slime extracellular polymeric substances -- Sludge flocs -- Sludge dewaterability -- Filamentous fungus; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.06.019
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Filamentous fungus Mucor sp. GY-1 enhanced sludge dewaterability by 82.1%. Slime EPS and polysaccharide in slime EPS were degraded by Mucor sp. GY-1. Mucor sp. GY-1 inhibited the destruction of sludge flocs. Both EPS degradation and inhibited floc destruction enhanced sludge dewaterability. Abstract: Mechanisms responsible for the sludge dewaterability enhanced by filamentous fungi during fungal treatment of sludge were investigated in the present study. The filamentous fungus Mucor sp. GY-1, isolated from waste activated sludge, enhanced sludge dewaterability by 82.1% to achieve the lowest value of normalized sludge specific resistance to filtration (SRF), 8.18 × 10 10 m·L/kg·g-TSS. During the fungal treatment of sludge, 57.8% of slime extracellular polymeric substances (EPS) and 51.1% of polysaccharide in slime EPS were degraded, respectively, by Mucor sp. GY-1, contributing to the improvement of sludge dewaterability. Slime EPS is much more available for Mucor sp. GY-1 than either LB-EPS or TB-EPS that bound with microbial cells. In addition, filamentous fungus Mucor sp. GY-1 entrapped small sludge particles and inhibited the destruction of sludge flocs larger than 100 μm, thus enhancing sludge dewaterability, during fungal treatment of sludge using Mucor sp. GY-1.